Reland "Cache text blobs computed by TextLine::paintText"

Change-Id: If166d7a2b287774054f833ac0f7b564bbcac9fa8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/342936
Reviewed-by: Julia Lavrova <jlavrova@google.com>
Commit-Queue: Jason Simmons <jsimmons@google.com>
2 files changed